Create a new table Media

attributes: ProductID, AlternateID, ProductLine, Quantity, UnitCost

include the following constraints:

ProductID $-$ PK

AlternateID $-$ Unique

ProductLine $-$ values need to be either book or movie

Quantity $-$ default $1$

UnitCost $->0$

Add a trigger that after an insert, it computes the quantity $*$ unitcost and adds it to a temporary total variable